but do they have to fill out any forms or do they contact the VA? am i supposed to give them something?
You need to show your certificate of eligibility. Here is how it worked at my law school for the past two years (granted this was under the old Chapter 30 GIBill but I imagine the procedure will be similar under the post 9/11 version).
1. You will present your certificate of eligibility to the Veteran's affairs coordinator.
2. Once the drop/add period ends at the school the coordinator will send the info into the VA.
3. It will probably take about 6-8 weeks to get the first check (but it will be retroactive).
4. For subsequent months you will need to verify your enrollment on the last day of the month (it is easy, they have an online version you just click a button) then the payments get dumped in your account after a few days.
I suspect that there may well be delays getting that first check, the good thing is that you will get all the back pay, the bad thing is that you need to cover that money now. However, since the new program pays the tuition directly to the school and the allowances directly to you it may be different.